$\frac{1-\sin\left(x\right)}{\cos\left(x\right)}-\frac{\cos\left(x\right)}{1+\sin\left(x\right)}=0$
$\lim_{x\to\infty}\left(x^7\cdot e^x\right)$
$\left(2\right)\left(\frac{y^2}{4}\right)\left(z^2\right)$
$12x+20>4x-12$
$\frac{x}{5}+\frac{x}{2}+\frac{x}{4}<19$
$12-\left(3\cdot4\right)-5\cdot2$
$-43x\::\:x$
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